Liquid crystal display module, liquid crystal display and its illuminator

ABSTRACT

A liquid crystal display module in which its color shift is reduced. The liquid crystal display module comprises a liquid crystal panel having such wavelength dependency that the transmittance to incident illumination light is different depending on both the incident angle and the wavelength of the illumination light and its anisotropy is different in the lateral direction and the vertical direction, and a plurality of single color light sources having different light distribution characteristics of emission wavelength and illuminating the liquid crystal panel from the back, wherein the plurality of single color light sources emit illumination light having light distribution characteristics for relaxing the wavelength dependency and the anisotropy.

TECHNICAL FIELD

The present invention relates to a liquid crystal display module, liquidcrystal display apparatus, and illumination apparatus thereof.

BACKGROUND ART

Thin, lightweight liquid crystal display apparatuses capable of imagedisplay have rapidly become widespread due to price reductions and thedevelopment of high-image-quality technology resulting from advances inmanufacturing techniques, and are widely used in personal computermonitors, TV receivers, and the like.

A transmission liquid crystal display apparatus is generally used as aliquid crystal display apparatus. A transmission liquid crystal displayapparatus is equipped with a planar light source called a backlight,illumination light from which is spatially modulated by a liquid crystalpanel and forms an image.

One problem in terms of the performance of such a liquid crystal displayapparatus is the “color shift” phenomenon whereby colors vary accordingto the observation direction. This is due to the fact that there isangular dependency in the transmittance of emitted light of a liquidcrystal panel, and there is also anisotropy in wavelength dependency(wavelength dispersion). Another problem is anisotropy in a lightdistribution characteristic of a backlight.

FIG. 1 is a graph showing the results of measuring a horizontal (liquidcrystal panel horizontal-direction) light distribution characteristicwhen the single colors red, blue, and green are displayed by a liquidcrystal display apparatus that uses TN liquid crystal. It can be seenthat long-wavelength red light shows a relatively wide lightdistribution profile, while short-wavelength blue light shows arelatively narrow light distribution profile.

FIG. 2 is a graph showing the results of evaluating a light distributioncharacteristic via red, green, and blue color filters when the liquidcrystal panel of the liquid crystal display apparatus used for the FIG.1 measurements is removed and the backlight is lit. As can be seen fromFIG. 2, no particular wavelength dispersion is perceived in illuminationlight from the backlight, and it is evident that the pronouncedwavelength dispersion perceived in FIG. 1 is due to the characteristicsof the liquid crystal panel.

As a result of the above light distribution characteristic, when ascreen displaying white is observed, it appears bluish from a relativelyfrontal direction and reddish from a direction at a large angle. This isillustrated schematically in FIG. 3.

In order to lessen the above color shift phenomenon, a method has beenproposed whereby light sources of each of the three primary colors areused, and these are made incident on a light-guide-plate-side surfacewith a different light distribution characteristic (see Patent Document1).

-   Patent Document 1: Japanese Patent Application Laid-Open No.    2004-61693

DISCLOSURE OF INVENTION Problems to be Solved by the Invention

However, a problem with the method of using light sources of each of thethree primary colors, and making these incident on alight-guide-plate-side surface with a different light distributioncharacteristic, is a tendency for color unevenness to occur.

A light guide plate repeatedly performs full reflection between opposingmain surfaces of light incident from an end surface, propagating thelight toward the end surface opposite the incident end, and emits partof that light by means of a diffusion section provided on one opposingmain surface or a diffusion material dispersed within the light guideplate.

In order to obtain uniform illumination from the entire surface of thelight guide plate, it is necessary to set the formation density andpattern size distribution of the diffusion section, and the diffusiondensity distribution of the diffusion material, appropriately. However,the incident light propagation and emission situation varies accordingto the light distribution pattern of the incident light. Specifically,when light distribution of incident light is wide, the proportion oflight emitted from the vicinity of the incident surface of the lightguide plate is large, the incident side of the light guide plate isbright, and the opposite side is dark. Conversely, when the directivityof incident light is sharp, the incident side of the light guide plateis dark, and the opposite side is bright.

For example, when the light distribution pattern of blue light iswidened relatively and is incident on the light guide plate, as in theimplementation example of Patent Document 1, color unevenness occurs,with the vicinity of the incident side of the light guide plate becomingbluish, and the opposite side reddish.

Therefore, a difficulty with the method whereby the light distributionpattern is varied lies in reconciling lessening of the observation anglerelated color shift phenomenon with achievement of a uniform displayshowing no color unevenness over the entire screen.

Also, depending on the liquid crystal panel mode, the above-describedcolor shift phenomenon does not necessarily occur equally andisotropically in the vertical, horizontal, and diagonal directions.

FIG. 4 shows the results of measuring a vertical (liquid crystal panelvertical-direction) single-color light distribution characteristic whenthe same kind of single-color display is performed using TN liquidcrystal for which the characteristic in FIG. 1 was measured. As can beseen from FIG. 4, for the vertical direction, there is no significantwavelength dispersion within a range of [practical viewing anglerange±40°]. Therefore, when wavelength dispersive illumination is alsoperformed in the vertical direction in the same way as in the horizontaldirection, a color shift is actually generated. Also, compared with thehorizontal-direction light distribution characteristic shown in FIG. 1,the vertical-direction light distribution characteristic shows a markeddrop in transmittance as the measurement angle increases. That is tosay, there is anisotropy in the light distribution characteristic inemitted light from the liquid crystal display apparatus. This lightdistribution characteristic anisotropy is a characteristic of thebacklight.

Therefore, in order to reduce a color shift in the vertical, horizontal,and diagonal directions, it is necessary to emit illumination light thatimparts wavelength dependency in the horizontal direction, and giveanisotropy to the wavelength dependency of illumination light. However,a problem with the conventional method of using a light guide plate andvarying the directivity of light incident from a side surface thereof isthat it is difficult to control wavelength dependency and anisotropy ofwavelength dependency.

The present invention has been implemented taking into account theproblems described above, and it is an object of the present inventionto provide a liquid crystal display module, liquid crystal displayapparatus, and illumination apparatus thereof that lessen a color shiftfor various observation angles—horizontal, vertical, and diagonal—evenwhen using a liquid crystal panel having wavelength dependency wherebytransmittance for incident illumination light differs according to boththe incident angle and wavelength of illumination light, and also havinganisotropy whereby the wavelength dependency differs in the horizontaldirection and the vertical direction.

Means for Solving the Problems

A liquid crystal display module of the present invention is equippedwith a liquid crystal panel having wavelength dependency wherebytransmittance for incident illumination light differs according to boththe incident angle and wavelength of illumination light, and also havinganisotropy whereby wavelength dependency differs in the horizontaldirection and the vertical direction, and a plurality of single-colorlight sources whose emission wavelength light distributioncharacteristics differ and that illuminate the liquid crystal panel fromthe back surface; wherein the plurality of single-color light sourcesemit illumination light having a light distribution characteristic thatlessens wavelength dependency and anisotropy.

An illumination apparatus of the present invention illuminates from itsback surface a liquid crystal panel having wavelength dependency wherebytransmittance for incident illumination light differs according to boththe incident angle and wavelength of illumination light, and also havinganisotropy whereby wavelength dependency differs in the horizontaldirection and the vertical direction; and employs a configurationequipped with a plurality of single-color light sources whose emissionwavelength light distribution characteristics differ, and a base onwhich the plurality of single-color light sources are arranged; whereinthe plurality of single-color light sources emit illumination lighthaving a light distribution characteristic that lessens wavelengthdependency and anisotropy.

A liquid crystal display apparatus of the present invention employs aconfiguration equipped with a liquid crystal panel having wavelengthdependency whereby transmittance for incident illumination light differsaccording to both the incident angle and wavelength of illuminationlight, and also having anisotropy whereby wavelength dependency differsin the horizontal direction and the vertical direction, an illuminationsection that has a plurality of single-color light sources whoseemission wavelength light distribution characteristics differ and thatilluminate the liquid crystal panel from the back surface, andilluminates the liquid crystal panel from the back surface, and adisplay control circuit that drives the liquid crystal panel anddisplays an image; wherein the plurality of single-color light sourcesemit illumination light having a light distribution characteristic thatlessens wavelength dependency and anisotropy.

Advantageous Effect of the Invention

A liquid crystal display apparatus of the present invention makespossible image display in which the occurrence of color unevenness isreduced.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a graph showing a horizontal light distribution characteristicwhen single-color display is performed by a TN liquid crystal displayapparatus;

FIG. 2 is a graph showing the results of evaluating a light distributioncharacteristic via red, blue, and green color filters when the liquidcrystal panel of the liquid crystal display apparatus used for the FIG.1 measurements is removed and the backlight is lit;

FIG. 3 is a schematic diagram showing the state of color shiftoccurrence when a liquid crystal panel is illuminated by generalillumination with no wavelength dispersion;

FIG. 4 is a graph showing a vertical light distribution characteristicwhen single-color display is performed by a TN liquid crystal displayapparatus;

FIG. 5 is a perspective view showing the configuration of an embodimentof a liquid crystal display module of the present invention;

FIG. 6 is a perspective view showing the configuration of an anisotropicwavelength dispersive light source unit according to an embodiment of aliquid crystal display module of the present invention;

FIG. 7 is a cross-sectional diagram explaining the operation of anembodiment of a liquid crystal display module of the present invention;

FIG. 8A is a graph showing the wavelength dependency of the refractiveindex of PMMA and MS, and FIG. 8B is a graph showing the wavelengthdependency of the relative refractive power (∝ refractive indexdifference) with PMMA, MS, and air media-combinations; and

FIG. 9 is a drawing showing an example of a matrix-type liquid crystaldisplay apparatus.

BEST MODE FOR CARRYING OUT THE INVENTION

The Embodiment of the present invention will now be described withreference to the accompanying drawings.

Embodiment 1

FIG. 5 is a perspective view showing the configuration of an embodimentof a liquid crystal display module of the present invention.

As an illumination apparatus of a liquid crystal display module,wavelength dispersive planar light source 300 (corresponding to an“illumination apparatus” of the present invention) is configured withmany wavelength dispersive light source units 310 arranged inside frame320 serving as a base, covered by diffusion sheet 330. The layeredcoding apparatus illumination apparatus is positioned below liquidcrystal panel 200.

FIG. 6 is a perspective view showing the configuration of wavelengthdispersive light source unit 310 in a liquid crystal display module ofEmbodiment 1. Red LED chip 311R is mounted on substrate 312R. Red LEDchip 311R is sealed with transparent resin 313R, forming red lightsource element 310R. Green light source element 310G and blue lightsource element 310B are formed in a similar way using green LED chip311G and blue LED chip 311B. Wavelength dispersive light source unit 310is configured by means of above red light source element 310R, greenlight source element 310G, and blue light source element 310B.

Red light source element 310R, green light source element 310G, and bluelight source element 310B have different shapes for the projecting partof the sealing resin to cause the emission wavelength light distributioncharacteristics to differ. Setting is performed so that, in the xdirection in FIG. 6, light distribution of blue light source element310B is relatively wide, light distribution of red light source element310R is relatively narrow, and light distribution of green light sourceelement 310G is intermediate. That is to say, the shapes of theprojecting parts of the sealing resin are formed so that light diffusionof blue light source element 310B is relatively large. Thus, setting isperformed so that light emitted from the plurality of single-color lightsources has wavelength dependency that is the reverse of the wavelengthdependency of the liquid crystal panel. The light distributioncharacteristics of the plurality of single-color light sources are thusset so that light emitted from the plurality of single-color lightsources lessens the wavelength dependency of liquid crystal panel 200.Settings are also made so that the light distribution characteristic isthe same for 310R, 310G, and 310B in the y direction in FIG. 6. Asstated above, there is no significant wavelength dependency in the ydirection. Therefore, setting an identical light distributioncharacteristic for 310R, 310G, and 310B in the y direction enableswavelength dependency anisotropy to be lessened. Thus, there iswavelength dispersion in the x direction and no wavelength dependency inthe y direction, and wavelength dispersive light source units 310 havingwavelength dependency and anisotropy in wavelength dependency can beobtained.

The plurality of light sources (310R, 310G, and 310B) may also havelight distribution characteristics such that a light distributioncharacteristic of emitted light differs in the liquid crystal panel 200horizontal direction (x direction) and vertical direction (y direction).Specifically, horizontal-direction light distribution is wider thanvertical-direction light distribution. For example, the plurality ofsingle-color light sources are arranged so as to have directivity in theliquid crystal panel 200 horizontal direction, and are arranged so as tohave alight distribution characteristic with large diffusion in theliquid crystal panel 200 vertical direction. Making diffusion large inthe liquid crystal panel 200 vertical direction enables a diffusionsheet with relatively high diffusion in the horizontal direction to beused. By this means, the plurality of single-color light sources areconfigured so as to adjust the light distribution characteristic balancein the vertical direction and in the horizontal direction. Moreover,taking a characteristic of the diffusion sheet into consideration, it ispossible to make a setting so that the characteristics of the pluralityof single-color light sources lessen liquid crystal panel wavelengthdependency and anisotropy, and adjust the light distributioncharacteristic balance.

Operation details will now be explained using FIG. 7.

FIG. 7 is a cross-sectional diagram of an embodiment of a liquid crystaldisplay apparatus of the present invention, showing the principal partsin FIG. 5 sectioned through the xz plane.

As described above, wavelength dispersive light source unit 310 emitslight with comparatively sharp directivity for long-wavelength red light(solid lines in FIG. 7), and emits light with comparatively largediffusion for short-wavelength blue light (dotted lines in FIG. 7).

Diffusion sheet 330 has an effect of increasing the uniformity ofillumination by re-diffusing light from wavelength dispersive lightsource unit 310. Light transmitted through diffusion sheet 330 has itsdiffusion somewhat increased and its wavelength dispersion somewhatlessened. The light distribution characteristics of the plurality ofsingle-color light sources and the light distribution characteristic ofthe diffusion sheet are set so as to correct wavelength dependency andanisotropy of wavelength dependency of emitted light from the liquidcrystal panel. The light distribution characteristic of diffusion sheet330 is set so as to complement the light distribution characteristics ofthe plurality of single-color light sources. Also, the lightdistribution characteristics of the plurality of single-color lightsources may be set so as to complement the light distributioncharacteristic of diffusion sheet 330.

The light distribution characteristics of wavelength dispersive lightsource units 310 and the diffusion characteristic of diffusion sheet 330are set so that wavelength dispersion of a light distributioncharacteristic of light transmitted through diffusion sheet 330 lessensthe wavelength dispersion of transmittance of liquid crystal panel 200.

As a result, light that has been transmitted through the liquid crystalpanel has fixed proportions of red, blue, and green regardless of theobservation angle, and color shift occurrence can be reduced within aneffective viewing range.

In the y direction, anisotropic wavelength dispersive light source unit310 emits light with equal light distribution profiles for red, blue,and green. The emitted light then passes through diffusion sheet 330 andis incident on liquid crystal panel 200 with equal light distributionprofiles. Since there is no significant wavelength dispersion within theeffective viewing range of liquid crystal panel 200 in the y direction,no new color shift occurs.

In the above embodiment, a TN liquid crystal substrate is used that hasanisotropy in wavelength dispersion of incident angle dependency oftransmittance, and anisotropic wavelength dispersive illumination (byanisotropic wavelength dispersive light source units 310) is used thathas wavelength dispersion and anisotropy in wavelength dependency.However, the present invention is not limited to this. For example, ifliquid crystal whose transmittance wavelength dispersion is virtuallyisotropic, such as VA liquid crystal, is used, it is desirable to useillumination for which the wavelength dispersion of illumination lightis also isotropic.

Diffusion sheet 330 may be configured in such a way that light diffusershaving a refractive index different from the refractive index of atransparent base material are dispersed in the thickness direction ofthe transparent base material, incident light from the plurality ofsingle-color light sources is refracted a plurality of times, wavelengthdependency that is the reverse of the wavelength dependency can beimparted to light emitted from the plurality of single-color lightsources, and that light can be emitted.

FIG. 8A is a graph showing the wavelength dependency of the refractiveindex of general PMMA (acrylic) and MS (a copolymer of acrylic andstyrene) as a transparent resin material. The horizontal axis representswavelength, and the vertical axis represents the refractive index. Asshown in FIG. 8A, the refractive index is not fixed, but iswavelength-dependent (this kind of wavelength dependency phenomenon iscalled wavelength dispersion). With general optical materials, there isa tendency for the refractive index to be higher the shorter thewavelength. As absolute refractive power is small at the interfacebetween transparent resin materials, a plurality of refractions arenecessary. A method whereby light diffusers 340 are dispersed in thethickness direction in the base material of diffusion sheet 330 iseffective for this purpose. Particles or fine fibers can be used aslight diffusers 340.

When light is incident from a particular medium onto another medium witha different refractive index, refraction occurs at the interface inaccordance with Snell's law, and the refractive power is proportional tothe refractive index difference of the two media.

FIG. 8B is a graph showing the wavelength dependency of relativerefractive power when above PMMA and MS are refracted at the interfacewith air (refractive index 1 irrespective of the wavelength), and at theinterface of PMMA and MS. The horizontal axis represents wavelength, andthe vertical axis represents relative refractive power. The verticalaxis shows relative values with the refractive index differencenormalized at a value for a 546 nm measurement wavelength.

As shown here, wavelength dispersion is significantly greater forrefraction at the PMMA/MS interface than for refraction at the PMMA/airor MS/air interface. Implementation of diffusion with large wavelengthdispersion can therefore be expected by using refraction at an interfaceof the two.

However, since the refractive index difference of the two is small, itis difficult to perform adequate diffusion with a 2-layer structure ofPMMA and MS with one surface having projections and depressions as theinterface, as in the case of an interface with air. Thus, opportunitiesfor refraction are increased by using one material as a medium anddispersing light diffusers 340 of the other material therein in thethickness direction.

If fine fibers are used as light diffusers 340, illumination light canbe obtained for which wavelength dispersion is large in the x directionand wavelength dispersion is small in the y direction. By using eitherparticles or fine fibers, taking the light distribution characteristicsof the plurality of single-color light sources into consideration, aliquid crystal display module can be implemented that effectivelyilluminates a liquid crystal panel that has wavelength dispersion andanisotropy in wavelength dependency such that the light distributioncharacteristic of emitted light from the liquid crystal panel differs ona wavelength-by-wavelength basis, and has a small color shift withrespect to any observation angle, and that makes possible image displayin which the light distribution characteristic balance has beenadjusted.

If it is not necessary to impart wavelength dependency by means ofdiffusion sheet 330 to emitted light from the plurality of single-colorlight sources, it is not necessary for diffusion sheet 330 to have lightdiffusers 340. In this case, emitted light from the plurality ofsingle-color light sources may be diffused using a commerciallyavailable diffusion sheet.

As described above, according to a configuration of the presentinvention, a liquid crystal display apparatus can be implemented thatcorrects wavelength dispersion and anisotropy in wavelength dependencysuch that the light distribution characteristic of emitted light fromthe liquid crystal panel differs on a wavelength-by-wavelength basis,and has high display quality with little color unevenness due to theobservation angle, by means of a simple method without using a pluralityof hologram sheets.

<Matrix-Type Liquid Crystal Display Apparatus>

FIG. 9 shows an example of a matrix-type liquid crystal displayapparatus. This matrix-type liquid crystal display apparatus 1000 iscomposed of matrix-type liquid crystal display module 1010, displaysignal line drive circuit 1020, and scan signal line drive circuit 1030.Display control circuitry of the present invention corresponds todisplay signal line drive circuit 1020 and scan signal line drivecircuit 1030. Matrix-type liquid crystal display module 1010 is composedof a liquid crystal panel, a planar light source that illuminates theliquid crystal panel from its back surface, and a diffusion sheet thatis positioned between the liquid crystal panel and the planar lightsource.

In the liquid crystal panel, p display signal lines 1011 and n scansignal lines 1012 are arranged in the form of a matrix, and a liquidcrystal display element 1013 is formed between a signal electrode andscan electrode at each intersection point. Display signal line drivecircuit 1020 outputs display signals (drive signals) via display signallines 1011. Scan signal line drive circuit 1030 outputs scan signals viascan signal lines 1012. Liquid crystal display elements 1013 are drivenby the potential difference between a display signal and a scan signal.Drive power supply apparatus 1040 supplies power to display signal linedrive circuit 1020 and scan signal line drive circuit 1030.

Display signal line drive circuit 1020 and scan signal line drivecircuit 1030 are formed from liquid crystal drive controller integratedcircuits (ICs).

As the drive method of this matrix-type liquid crystal display apparatus1000 by means of display signal line drive circuit 1020 and scan signalline drive circuit 1030, there is a time-division drive method wherebyscan signals are output sequentially to scan signal lines 1012, andliquid crystal drive is performed by applying a selectionvoltage/non-selection voltage (scan signal) from display signal line1011 according to selection/non-selection data for liquid crystaldisplay element 1013 on scan signal line 1012 while that scan signalline 1012 is selected. With this time-division drive method, setting isperformed so that the number obtained by dividing verticalsynchronization signal cycle T by the period during which one scansignal line is selected is the same as number of scan signal lines n.

Since driving liquid crystal with a direct current causes deteriorationof the liquid crystal itself, lowering display quality and significantlyaffecting operational life, liquid crystal requires alternating currentdrive, and in the above general matrix-type liquid crystal displayapparatus 1000 time-division drive method, alternation is performed bydriving with a polarity inversion (alternation) signal whose polarity isinverted each time natural number k (smaller than number of scan signallines n) scan signal lines 1030 are selected.

The disclosure of Japanese Patent Application No. 2006-113147, filed onApr. 17, 2006, including the specification, drawings and abstract, isincorporated herein by reference in its entirety.

INDUSTRIAL APPLICABILITY

The present invention enables a video display to be implemented in whichthe occurrence of color unevenness due to the observation angle isreduced in the horizontal, vertical, and diagonal directions, and cancontribute to improving the display performance of a video displayapparatus such as a liquid crystal TV, liquid crystal monitor, or thelike.

1. A liquid crystal display module comprising: a liquid crystal panelhaving wavelength dependency whereby transmittance for incidentillumination light differs according to both an incident angle and awavelength of illumination light, and also having anisotropy whereby thewavelength dependency differs in a horizontal direction and a verticaldirection; and a plurality of single-color light sources whose emissionwavelength light distribution characteristics differ and that illuminatethe liquid crystal panel from a back surface, wherein the plurality ofsingle-color light sources emit illumination light having a lightdistribution characteristic that lessens the wavelength dependency andthe anisotropy.
 2. The liquid crystal display module according to claim1, wherein emitted light colors of the plurality of single-color lightsources are three primary colors red, green, and blue, and diffusion ofblue is relatively large.
 3. The liquid crystal display module accordingto claim 1, wherein the plurality of single-color light sources arearranged so as to have directivity in a horizontal direction of theliquid crystal panel.
 4. The liquid crystal display module according toclaim 1, wherein the plurality of single-color light sources arearranged so as to have a light distribution characteristic with largediffusion in a vertical direction of the liquid crystal panel.
 5. Theliquid crystal display module according to claim 1, further comprising adiffusion sheet between the plurality of single-color light sources andthe liquid crystal panel, wherein light distribution characteristics ofthe plurality of single-color light sources and a light distributioncharacteristic of the diffusion sheet are set so as to lessen thewavelength dependency and the anisotropy.
 6. The liquid crystal displaymodule according to claim 1, further comprising a diffusion sheetbetween the plurality of single-color light sources and the liquidcrystal panel, wherein the diffusion sheet has, within a transparentbase material, light diffusers having a refractive index different froma refractive index of the base material, dispersed in a thicknessdirection of the transparent base material, causes light emitted fromthe plurality of single-color light sources to be refracted a pluralityof times, imparts wavelength dependency that is a reverse of thewavelength dependency to light emitted from the plurality ofsingle-color light sources, and emits that light.
 7. An illuminationapparatus that illuminates from its back surface a liquid crystal panelhaving wavelength dependency whereby transmittance for incidentillumination light differs according to both an incident angle andwavelength of the illumination light, and also having anisotropy wherebythe wavelength dependency differs in a horizontal direction and avertical direction, the illumination apparatus comprising: a pluralityof single-color light sources whose emission wavelength lightdistribution characteristics differ; and a base on which the pluralityof single-color light sources are arranged, wherein the plurality ofsingle-color light sources emit illumination light having a lightdistribution characteristic that lessens the wavelength dependency andthe anisotropy.
 8. The illumination apparatus according to claim 7,wherein emitted light colors of the plurality of single-color lightsources are three primary colors red, green, and blue, and diffusion ofblue is relatively large.
 9. The illumination apparatus according toclaim 7, wherein the plurality of single-color light sources arearranged so as to have directivity in a horizontal direction of theliquid crystal panel.
 10. The illumination apparatus according to claim7, wherein the plurality of single-color light sources are arranged soas to have a light distribution characteristic with large diffusion in avertical direction of the liquid crystal panel.
 11. The illuminationapparatus according to claim 7, further comprising a diffusion sheetbetween the plurality of single-color light sources and the liquidcrystal panel, wherein light distribution characteristics of theplurality of single-color light sources and a light distributioncharacteristic of the diffusion sheet are set so as to lessen thewavelength dependency and the anisotropy.
 12. The illumination apparatusaccording to claim 7, further comprising a diffusion sheet between theplurality of single-color light sources and the liquid crystal panel,wherein the diffusion sheet has, within a transparent base material,light diffusers having a refractive index different from a refractiveindex of the base material, dispersed in a thickness direction of thetransparent base material, causes light emitted from the plurality ofsingle-color light sources to be refracted a plurality of times, impartswavelength dependency that is a reverse of the wavelength dependency tolight emitted from the plurality of single-color light sources, andemits that light.
 13. A liquid crystal display apparatus of the presentinvention comprising: a liquid crystal panel having wavelengthdependency whereby transmittance for incident illumination light differsaccording to both an incident angle and wavelength of the illuminationlight, and also having anisotropy whereby the wavelength dependencydiffers in a horizontal direction and a vertical direction; anillumination section that has a plurality of single-color light sourceswhose emission wavelength light distribution characteristics differ andthat illuminate the liquid crystal panel from aback surface, andilluminates the liquid crystal panel from the back surface; and adisplay control circuit that drives the liquid crystal panel anddisplays an image, wherein the plurality of single-color light sourcesemit illumination light having a light distribution characteristic thatlessens the wavelength dependency and the anisotropy.
 14. The liquidcrystal display apparatus according to claim 13, wherein emitted lightcolors of the plurality of single-color light sources are three primarycolors red, green, and blue, and diffusion of blue is relatively large.15. The liquid crystal display apparatus according to claim 13, whereinthe plurality of single-color light sources are arranged so as to havedirectivity in a horizontal direction of the liquid crystal panel. 16.The liquid crystal display apparatus according to claim 13, wherein theplurality of single-color light sources are arranged so as to have alight distribution characteristic with large diffusion in a verticaldirection of the liquid crystal panel.
 17. The liquid crystal displayapparatus according to claim 13, further comprising a diffusion sheetbetween the plurality of single-color light sources and the liquidcrystal panel, wherein light distribution characteristics of theplurality of single-color light sources and a light distributioncharacteristic of the diffusion sheet are set so as to lessen thewavelength dependency and the anisotropy.
 18. The liquid crystal displayapparatus according to claim 13, further comprising a diffusion sheetbetween the plurality of single-color light sources and the liquidcrystal panel, wherein the diffusion sheet has, within a transparentbase material, light diffusers having a refractive index different froma refractive index of the base material, dispersed in a thicknessdirection of the transparent base material, causes light emitted fromthe plurality of single-color light sources to be refracted a pluralityof times, imparts wavelength dependency that is a reverse of thewavelength dependency to light emitted from the plurality ofsingle-color light sources, and emits that light.